Recently people from electric power station requested super thin flexible borescope. It is amazing how small such a borescope can be! We provided this super thin borescope with diameter only 1.0 mm! And the length was 152 cm! You can imagine how carefully one should work with such a fragile thing.
But it is worth it. Sometimes it is required to observe details in very small areas, where only such a small probe can go. And this super thin borescope is supplied with free light source that provides a nice illumination of inspected area. It is also possible to attach a video camera to see all things on a large screen.